Fix missing keystone option in ironic.conf.sample
Fix missing keystone option in ironic.conf.sample

Add missing keystoneclient option 'enforce_token_bind' to ironic.conf.sample.

Change-Id: Ie4e555dad11c0f01776c3865415f663045cb221e

naototty/vagrant-lxc-ironic,JioCloud/ironic,ramineni/myironic,debayanray/ironic_backup,pshchelo/ironic,Tan0/ironic,froyobin/ironic,rdo-management/ironic,devananda/ironic,varunarya10/ironic,redhat-openstack/ironic,pshchelo/ironic,hpproliant/ironic,NaohiroTamura/ironic,dims/ironic,SauloAislan/ironic,bacaldwell/ironic,dims/ironic,naototty/vagrant-lxc-ironic,openstack/ironic,NaohiroTamura/ironic,naterh/ironic,rackerlabs/ironic,ionutbalutoiu/ironic,SauloAislan/ironic,ionutbalutoiu/ironic,supermari0/ironic,openstack/ironic,Tehsmash/ironic,faizan-barmawer/openstack_ironic,bacaldwell/ironic